#air

• Airbase — A military airbase or a large aeronautical complex comprising airfields, takeoff and landing runways, hangars, repair shops, fuel and ammunition depots, as well as the logistical infrastructure necessary for the stationing, maintenance, and operation of military or commercial aircraft.
• Aerobiology — An interdisciplinary branch of biology that deals with the study of living organisms and particles of biological origin (such as bacteria, fungi, pollen, spores, cysts, and viruses) passively transported through the air, as well as with the analysis of their movement, survival, and impact on the environment and human health.
• Aerobioscope — A laboratory apparatus used for collecting, filtering, and determining the number of microorganisms (bacteria, fungal spores) present in a specific volume of air. This device operates by bubbling air through a sterile liquid or by impacting particles onto a solid culture medium, being essential for air hygiene monitoring in hospitals, laboratories, and pharmaceutical industries.
• Aerocyst — An anatomical structure in the shape of a bladder, pouch, or sac filled with air, found in the stem or leaf structure of certain aquatic plants and marine algae (such as those of the genus Fucus). This floating vesicle functions as a natural hydrostatic organ, keeping the plant at the water surface to capture a maximum amount of sunlight required for photosynthesis.
• Aerocompass — An aerial navigation instrument (gyroscopic, magnetic, or electronic compass) mounted on board aircraft, used for continuously determining and indicating the magnetic heading or flight direction of the aircraft relative to cardinal points.
• Airborne — A specialized military troop, equipment, or tactical operation involving parachuting or direct landing from aircraft behind enemy lines or in strategic conflict zones. This type of mobile airborne infantry is trained for rapid assaults, capturing key objectives, and holding positions until the arrival of the main ground forces.
• Aerodyne — Any aircraft heavier than air, whose support and lift in the Earth's atmosphere are provided exclusively by the dynamic forces exerted by air on its lifting surfaces (fixed wings or moving rotors) during travel. The classification includes airplanes, helicopters, gliders, and drones, representing the opposite of aerostats.
• Aerodyne — A general or historical technical term used to designate any aircraft heavier than air (such as airplanes, helicopters, or gliders), whose support and lift in the atmosphere are provided exclusively by aerodynamic forces generated by the relative motion of its lifting surfaces (wings, rotors) in contact with the airflow. It represents the opposite of aerostats (balloons, zeppelins), which float based on Archimedean buoyancy.
• Aerodynamic — Relating to aerodynamics, concerning the motion of air and gases relative to solid bodies; having a fluid and optimized geometric shape, specially designed to minimize the drag resistance opposed by air during movement. It is widely applied in the design of aircraft, high-speed vehicles, and high-performance sports equipment.
• Aerodrome craft — An archaic, rare, or conceptual technical term used to describe an experimental heavier-than-air aircraft, an early prototype of a self-propelled airplane, or a covered dome-shaped structure designed for sheltering and protecting flight machines inside an airfield.
• Aerodrome — A defined area on land or water (including any buildings, installations, and equipment) intended to be used either wholly or in part for the arrival, departure, and surface movement of aircraft. Unlike a fully developed commercial airport, it may feature simplified infrastructure, often being utilized for sports aviation, utility flights, flight schools, or military operations.
• Air duct — A large-sized pipe, structural tube, artificial channel, or complex technical installation specially designed for capturing, transporting, conveying, or distributing air masses or other gases within an industrial, mining, or urban ventilation system. The term can also conceptually describe a secured aerial corridor intended exclusively for the controlled transit of certain pneumatic flows.
• Aeroelasticity — A branch of mechanics and aerospace engineering that studies the interactions between aerodynamic forces, the elastic forces of a solid body's structure, and its inertial forces, while in relative motion. This field is crucial in the design of high-speed aircraft and suspended bridges to prevent destructive structural instability phenomena, such as flutter or buffeting.
• Avionics — A specialized branch of applied electronics and aeronautical engineering dealing with the design, manufacturing, installation, and maintenance of electronic systems and equipment used on board aircraft and rockets (navigation systems, communications, autopilot, radars, and cockpit sensors).
• Air embolism — A severe medical condition characterized by the entry and entrapment of air or gas bubbles inside the blood circulatory system, leading to the obstruction of blood vessels (ischemia) in vital tissues. This clinical phenomenon often occurs during invasive surgical procedures, severe traumas, or rapid decompression in divers or pilots.
• Aerophagia — A functional digestive disorder characterized by the involuntary and excessive swallowing of air during eating, speaking, or during periods of high anxiety, leading to gas buildup in the stomach, a feeling of fullness, frequent eructations, abdominal meteorism, and gastric discomfort.
• Aerobeacon — A high-power beacon installed at an airfield, on a control tower, or along an airway, emitting intermittent or rotating light beams to guide pilots at night or in low visibility conditions. It serves as a crucial visual landmark for runway location and safe airspace navigation.
• Aerophilatelic — Relating to aerophilately, concerning aerophilately; referring to the collection and study of stamps, postmarks, envelopes, and postal documents transported by air. This term describes collectible items, exhibitions, or specialized catalogs dedicated exclusively to the history of airmail.
• Aerophilately — A specialized branch of philately dealing with the study and collection of special postage stamps (airmail stamps), labels, postmarks, and postal documents transmitted via air transport (airplanes, helicopters, zeppelins, or rockets). It tracks the evolution of postal rates and airways as well as aviation history reflected in documents.
• Aerophilatelist — A person or collector specialized in aerophilately; a specialist passionate about gathering, studying, classifying, and evaluating airmail stamps, flight postmarks, and postal documents that were actually transported by air via airplanes, helicopters, or airships.